loop-invariant-code-motion.mlir
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// RUN: mlir-opt %s -split-input-file -loop-invariant-code-motion | FileCheck %s
func @nested_loops_both_having_invariant_code() {
%m = alloc() : memref<10xf32>
%cf7 = constant 7.0 : f32
%cf8 = constant 8.0 : f32
affine.for %arg0 = 0 to 10 {
%v0 = addf %cf7, %cf8 : f32
affine.for %arg1 = 0 to 10 {
%v1 = addf %v0, %cf8 : f32
affine.store %v0, %m[%arg0] : memref<10xf32>
}
}
// CHECK: %0 = alloc() : memref<10xf32>
// CHECK-NEXT: %[[CST0:.*]] = constant 7.000000e+00 : f32
// CHECK-NEXT: %[[CST1:.*]] = constant 8.000000e+00 : f32
// CHECK-NEXT: %[[ADD0:.*]] = addf %[[CST0]], %[[CST1]] : f32
// CHECK-NEXT: addf %[[ADD0]], %[[CST1]] : f32
// CHECK-NEXT: affine.for
// CHECK-NEXT: affine.for
// CHECK-NEXT: affine.store
return
}
// -----
func @nested_loops_code_invariant_to_both() {
%m = alloc() : memref<10xf32>
%cf7 = constant 7.0 : f32
%cf8 = constant 8.0 : f32
affine.for %arg0 = 0 to 10 {
affine.for %arg1 = 0 to 10 {
%v0 = addf %cf7, %cf8 : f32
}
}
// CHECK: %0 = alloc() : memref<10xf32>
// CHECK-NEXT: %cst = constant 7.000000e+00 : f32
// CHECK-NEXT: %cst_0 = constant 8.000000e+00 : f32
// CHECK-NEXT: %1 = addf %cst, %cst_0 : f32
return
}
// -----
func @single_loop_nothing_invariant() {
%m1 = alloc() : memref<10xf32>
%m2 = alloc() : memref<10xf32>
affine.for %arg0 = 0 to 10 {
%v0 = affine.load %m1[%arg0] : memref<10xf32>
%v1 = affine.load %m2[%arg0] : memref<10xf32>
%v2 = addf %v0, %v1 : f32
affine.store %v2, %m1[%arg0] : memref<10xf32>
}
// CHECK: %0 = alloc() : memref<10xf32>
// CHECK-NEXT: %1 = alloc() : memref<10xf32>
// CHECK-NEXT: affine.for %arg0 = 0 to 10 {
// CHECK-NEXT: %2 = affine.load %0[%arg0] : memref<10xf32>
// CHECK-NEXT: %3 = affine.load %1[%arg0] : memref<10xf32>
// CHECK-NEXT: %4 = addf %2, %3 : f32
// CHECK-NEXT: affine.store %4, %0[%arg0] : memref<10xf32>
return
}
// -----
func @invariant_code_inside_affine_if() {
%m = alloc() : memref<10xf32>
%cf8 = constant 8.0 : f32
affine.for %arg0 = 0 to 10 {
%t0 = affine.apply affine_map<(d1) -> (d1 + 1)>(%arg0)
affine.if affine_set<(d0, d1) : (d1 - d0 >= 0)> (%arg0, %t0) {
%cf9 = addf %cf8, %cf8 : f32
affine.store %cf9, %m[%arg0] : memref<10xf32>
}
}
// CHECK: %0 = alloc() : memref<10xf32>
// CHECK-NEXT: %cst = constant 8.000000e+00 : f32
// CHECK-NEXT: affine.for %arg0 = 0 to 10 {
// CHECK-NEXT: %1 = affine.apply #map0(%arg0)
// CHECK-NEXT: affine.if #set0(%arg0, %1) {
// CHECK-NEXT: %2 = addf %cst, %cst : f32
// CHECK-NEXT: affine.store %2, %0[%arg0] : memref<10xf32>
// CHECK-NEXT: }
return
}
// -----
func @invariant_affine_if() {
%m = alloc() : memref<10xf32>
%cf8 = constant 8.0 : f32
affine.for %arg0 = 0 to 10 {
affine.for %arg1 = 0 to 10 {
affine.if affine_set<(d0, d1) : (d1 - d0 >= 0)> (%arg0, %arg0) {
%cf9 = addf %cf8, %cf8 : f32
}
}
}
// CHECK: %0 = alloc() : memref<10xf32>
// CHECK-NEXT: %[[CST:.*]] = constant 8.000000e+00 : f32
// CHECK-NEXT: affine.for %[[ARG:.*]] = 0 to 10 {
// CHECK-NEXT: }
// CHECK-NEXT: affine.for %[[ARG:.*]] = 0 to 10 {
// CHECK-NEXT: affine.if #set0(%[[ARG]], %[[ARG]]) {
// CHECK-NEXT: addf %[[CST]], %[[CST]] : f32
// CHECK-NEXT: }
return
}
// -----
func @invariant_affine_if2() {
%m = alloc() : memref<10xf32>
%cf8 = constant 8.0 : f32
affine.for %arg0 = 0 to 10 {
affine.for %arg1 = 0 to 10 {
affine.if affine_set<(d0, d1) : (d1 - d0 >= 0)> (%arg0, %arg0) {
%cf9 = addf %cf8, %cf8 : f32
affine.store %cf9, %m[%arg1] : memref<10xf32>
}
}
}
// CHECK: alloc
// CHECK-NEXT: constant
// CHECK-NEXT: affine.for
// CHECK-NEXT: affine.for
// CHECK-NEXT: affine.if
// CHECK-NEXT: addf
// CHECK-NEXT: affine.store
// CHECK-NEXT: }
// CHECK-NEXT: }
return
}
// -----
func @invariant_affine_nested_if() {
%m = alloc() : memref<10xf32>
%cf8 = constant 8.0 : f32
affine.for %arg0 = 0 to 10 {
affine.for %arg1 = 0 to 10 {
affine.if affine_set<(d0, d1) : (d1 - d0 >= 0)> (%arg0, %arg0) {
%cf9 = addf %cf8, %cf8 : f32
affine.if affine_set<(d0, d1) : (d1 - d0 >= 0)> (%arg0, %arg0) {
%cf10 = addf %cf9, %cf9 : f32
}
}
}
}
// CHECK: alloc
// CHECK-NEXT: constant
// CHECK-NEXT: affine.for
// CHECK-NEXT: affine.for
// CHECK-NEXT: affine.if
// CHECK-NEXT: addf
// CHECK-NEXT: affine.if
// CHECK-NEXT: addf
// CHECK-NEXT: }
// CHECK-NEXT: }
// CHECK-NEXT: }
return
}
// -----
func @invariant_affine_nested_if_else() {
%m = alloc() : memref<10xf32>
%cf8 = constant 8.0 : f32
affine.for %arg0 = 0 to 10 {
affine.for %arg1 = 0 to 10 {
affine.if affine_set<(d0, d1) : (d1 - d0 >= 0)> (%arg0, %arg0) {
%cf9 = addf %cf8, %cf8 : f32
affine.store %cf9, %m[%arg0] : memref<10xf32>
affine.if affine_set<(d0, d1) : (d1 - d0 >= 0)> (%arg0, %arg0) {
%cf10 = addf %cf9, %cf9 : f32
} else {
affine.store %cf9, %m[%arg1] : memref<10xf32>
}
}
}
}
// CHECK: alloc
// CHECK-NEXT: constant
// CHECK-NEXT: affine.for
// CHECK-NEXT: affine.for
// CHECK-NEXT: affine.if
// CHECK-NEXT: addf
// CHECK-NEXT: affine.store
// CHECK-NEXT: affine.if
// CHECK-NEXT: addf
// CHECK-NEXT: } else {
// CHECK-NEXT: affine.store
// CHECK-NEXT: }
// CHECK-NEXT: }
// CHECK-NEXT: }
return
}
// -----
func @invariant_loop_dialect() {
%ci0 = constant 0 : index
%ci10 = constant 10 : index
%ci1 = constant 1 : index
%m = alloc() : memref<10xf32>
%cf7 = constant 7.0 : f32
%cf8 = constant 8.0 : f32
scf.for %arg0 = %ci0 to %ci10 step %ci1 {
scf.for %arg1 = %ci0 to %ci10 step %ci1 {
%v0 = addf %cf7, %cf8 : f32
}
}
// CHECK: %0 = alloc() : memref<10xf32>
// CHECK-NEXT: %cst = constant 7.000000e+00 : f32
// CHECK-NEXT: %cst_0 = constant 8.000000e+00 : f32
// CHECK-NEXT: %1 = addf %cst, %cst_0 : f32
return
}
// -----
func @variant_loop_dialect() {
%ci0 = constant 0 : index
%ci10 = constant 10 : index
%ci1 = constant 1 : index
%m = alloc() : memref<10xf32>
scf.for %arg0 = %ci0 to %ci10 step %ci1 {
scf.for %arg1 = %ci0 to %ci10 step %ci1 {
%v0 = addi %arg0, %arg1 : index
}
}
// CHECK: %0 = alloc() : memref<10xf32>
// CHECK-NEXT: scf.for
// CHECK-NEXT: scf.for
// CHECK-NEXT: addi
return
}
// -----
func @parallel_loop_with_invariant() {
%c0 = constant 0 : index
%c10 = constant 10 : index
%c1 = constant 1 : index
%c7 = constant 7 : i32
%c8 = constant 8 : i32
scf.parallel (%arg0, %arg1) = (%c0, %c0) to (%c10, %c10) step (%c1, %c1) {
%v0 = addi %c7, %c8 : i32
%v3 = addi %arg0, %arg1 : index
}
// CHECK-LABEL: func @parallel_loop_with_invariant
// CHECK: %c0 = constant 0 : index
// CHECK-NEXT: %c10 = constant 10 : index
// CHECK-NEXT: %c1 = constant 1 : index
// CHECK-NEXT: %c7_i32 = constant 7 : i32
// CHECK-NEXT: %c8_i32 = constant 8 : i32
// CHECK-NEXT: addi %c7_i32, %c8_i32 : i32
// CHECK-NEXT: scf.parallel (%arg0, %arg1) = (%c0, %c0) to (%c10, %c10) step (%c1, %c1)
// CHECK-NEXT: addi %arg0, %arg1 : index
// CHECK-NEXT: yield
// CHECK-NEXT: }
// CHECK-NEXT: return
return
}